Universal milling head



Dec. 20, 1949 c, TREE UNIVERSAL MILLING HEAD 5 Sheets-Sheet 1 ,FiledNOV. '7, 1947 m m m fi I m ATTORNEYS Dec. 20, 1949 c. TREE UNIVERSALMILLING HEAD 5 Sheets-Sheet 2 Filed NOV. "7, 1947 \NVENTOR CHARLES TREEATTORNEYS Dec. 20,1949 c. TREE 2,491,940

UNIVERSAL MILLING HEAD Filed Nov. 7, 1947 5 Sheets-Sheet 3 [git/1121921fialib Dec. 20, 1949 c. TREE 2,491,940

UNIVERSAL MILLING HEAD Filed Nov. 7, 1947 5 Sheets-Sheet 4 INVENTORCHARLES TREE AT TORNEYS .Dec. 20, 1949 c, TREE 2,491,940

UNIVERSAL MILLING HEAD Filed Nov. 7, 1947 5 Sheets-Sheet 5 INVENTORCHARLES TREE ATTORNEYS Patented Dec. 20, 1949 UNITED STATES PATENTOFFICE 9 Claims.

This invention appertains to metal working machines and moreparticularly to a novel milling head of a universal character.

One of the primary objects of my invention is to provide a novelvertical milling head attachment for use with a. horizontal millingmachine, which can be quickly and easily clamped in position on theoverarm of the machine, whereby to readily convert the horizontalmilling machine into a vertical milling machine.

Another salient object of my invention is to provide a novel verticalmilling head attachment which can be readily swung to any desiredadjusted angular position on the overarm, both around the horizontalaxis of the arm and transversely to the horizontal axis of said arm.

A further object of my invention is to provide a vertical milling headattachment, which can also be effectively used as a drill press.

A further important object of my invention is to provide novel means forfeeding the spindle to the work either by hand or from the drive motorfor the spindle, novel means being provided for quickly disconnectingthe power drive from the spindle when the same is being advanced byhand.

A still further object of my invention is to provide a novel adjustablemicrometer stop or gauge for the spindlefor setting the travel of thespindle to the exact desired point, means being provided for allowingslipping of the power drive when the stop is reached, said stop beingmounted and closed on the head in a novel manner. l

A still further object of my invention is to provide a novel collet forthe tool or cutter with novel means for opening and closing the collet,whereby the desired cutters or tools can be quickly associated with orremoved from the collet.

A still further important object of my invention is to provide novelguide rollers between the rotary drive head and the spindle with novelmeans for taking up wear or play between the head and the spindle.

With these and other objects in view, the invention consists in thenovel construction. arrangement and formation of parts, as will behereinafter more specifically described, and claimed, and illustrated inthe accompanying drawings, in which drawings:

Figure l is a side elevational view of my novel vertical universalmilling head showing the same attached to the overarm of a horizontalmilling machine, parts of the attachment being shown broken away and insection.

Figure 2 is a vertical, sectional view through the universal head takenon the line 2--2 of Figure 1, looking in the direction of the arrows.

Figure 3 is a horizontal, sectional view through the head taken on theline 3--3 of Figure 2, looking in the direction of the arrows.

Figure 4 is an enlarged detail, vertical, sectiona1 view through thehead illustrating the means for advancing the quill and spindle by handand the releasable clutch between the power drive and the quill, theview also illustrating the means for adjusting the head angularly on theoverarm, the section being taken substantially on the line 4-4 of Figure1 looking in the direction of the arrows.

Figure 5 is a detail, sectional view through the clutch taken on theline '55 of Figure 4 looking in the direction of the arrows.

Figure 6 is a detail, sectional view taken on the line 6-6 of Figure 4looking in the direction of the arrows illustrating the return springfor the quill and spindle.

Figure 7 is an enlarged, detail, horizontal, sectional view taken on theline 'i--1 of Figure 2 looking in the direction of the arrowsillustrating the guide rollers and the adjusting means therefor foroperatively connecting the spindle with the rotary drive sleeve or head.

Figure 8 is an enlarged, fragmentary, detail,

sectional view taken at right angles to Figure '7 and on the line 8-8 ofFigure '7.

Figure 9 is a view similar to Figure 7 illustrating a modified form ofroller drive between the driving sleeve and the spindle.

Figure 10 is an enlarged detail, horizontal, sectional view taken on theline llllil of Figure 2 looking in the direction of the arrows,illustrating the novel means employed for opening and c osing thecollet, the collet being shown in its closed, operative grippingposition.

Figure 11 is a view simi ar to Fi ure 10 and showing the collet closeryoke shifted to a position for releasing the collet.

Figure 12 is a det il. vertical, central sectional view through theshifter yoke.

Figure 13 is a detail, sectional view through the lower end of the head,quill and spindle, the section being taken on the line |3-l3 of Figure10 and showing the collet in its clamping position.

Figure 14 is a view similar to Figure 13 but taken on the line l4-l4 ofFi ure 11 looking in the direction of the arrows and showing the colletin its released position.

Figure 15 is an enlarged, fragmentary, detail,

3 horizontal, sectional view taken on the line |5--l5 of Figure 1looking in the direction of the arrows and illustrating the meansutilized for clamping the quill in a set adjusted position.

Figure 16 is a detail, sectional view through the adjusting crank andits connection for the locking means of the quill, the section beingtaken on the line Iii-l6 of Figure 1.

Figure 17 is a detail, horizontal, sectional view through the collet,the view being taken substantially on the line of Figure 14, looking inthe direction of the arrows.

Referring to the drawings in detail wherein similar reference charactersdesignate corre: sponding parts throughout the several views, the letterA generally indicates my novel vertical universal milling headattachment for ahorizom tal milling machine M.

The milling machine M is of the type now found in the open market andwill not be describedin detail, but the same includes a body 20 havingan overarm 2| and a table 22 for the work. The work is adapted to beclamped to the table and the table can be of the type which can bereciprocated back; and forth.

The milling head attachment A is adapted to convert the horizontalmilling machine M into a vertical milling machine, and the head issupported in a novel fashion from the overarm 2|.

As illustrated, the milling-machine head attachment A comprises avertical body 23 which can be of a general cylindrical form. The bodyslidably 'rnounted therein for reciprocatory movement, the-milling headsleeve or quill 24 in which is rotatably mounted the spindle 25 to whichis adapted tg be clamped the cutter or other desired tools by a novel'collet structure 26 which will be later described in detail. Secured tothe upper end of the body 23 is a pulley housing support or casting 21andfitted on this support and secured thereto is the pulley guard 23.The upper end thereof is provided with aflange or collar 29 to which issecured an adapterplate St for the drive electric; motor 3|. The motor3| includes a depending armature shaft 33 and is provided with a controlbox 33 The motor can beof the reversible type and the control box 33carries suitable switches foropening and closing the circuit to themotor and for controlling the direction of rotation of the motor.

The spindle 25 is provided with lower bearings 34 and upper bearings 35and these bearings are separated by a bearing spacer sleeve 36. Theupper and lower bearings serve to effectively rotatably support thespindle in the quill, and the quill and spindle reciprocate as a unit. Abear lug nut 37 is threaded on the spindle for holding the bearings inplace. Attention is also directed to the fact thatthe spindle above thenut 3'! is provided with longitudinally extending guide grooves 38, thepurpose of which will also be later s'etf-orth;

Referring to the mounting of the body 23 upon the overarm 2|; I providean adapter 39 which includes a sleeve 40 for-snugly receiving theoverarm. The sleeve can be turned axially around the arm, if such shouldbe desired and can be clamped to the arm in an exact adjusted positionby any suitable means such as a set screw 3|. The adapter 39 is in thenature of a casting and also includes a front faceplate 42 which is asubstantially cylindrical form when viewed in top plan. The outer faceof the plate 42 is provided with upper andlower T-shaped guide groovesBand fitted against the plate 42 4 is a casting 44 having an arcuatesaddleplate 45. This plate carries T-headed bolts 25, and the heads arereceived in the slots 43. Nuts 4'! are threaded on the bolts 46 forholding the casting M in any preferred position around the plate 42, theupper surface of the plate M is provided with a graduated dial 48, andan indicating pointer or line 49 on the casting M cooperates with thegraduated dial 43 to facilitate the setting of the casting 44 Thecasting 44 also, includes, besides the saddle 45, a supporting disc 50,and this disc has formed concentrically on its outer face, a worm gear5|. Formed laterally on one side of the body 23.0f the head is anannular enlargemer t 5,2; fitted against the disc 50 around the wormgear 5|. This annular enlargement is provided with an annular concentricT-shaped groove 53 for receiving headed bolts 54 carried by the disc 50.The bolts 54 hold the disc tight against the annular enlargement 52 butpermit said enlargementwith the body 23 to turn on said disc "forangular adjustment. To bring about the accurate angular adjustment, thean? nular enlargement 52 is provided with a graduated scale 55 andcooperating with the scale is a pointer or line 56 on the edge of thedisc. A worm 51 is mounted upon a shaft 58 and is car-. ried by theannular enlargement 52, and this worm meshes withthe worm gear 5|, sothat by turning the shaft 58 and the worm 51, the annu-.. larenlargement 52' with the head 23 can be readily turned. One end of theshaft 58 protrudes eyond one side of the enlargement 52 and can beprovided'with a polygonal terminal for receiving a hand crank 01 wrench,not shown.

From the description so far, it can be seen that the head and its body23 can be moved around the forward end of the overarm 2| to a desiredsetposition and can then be swung about the horizontal axis of theoverarm to any desired set angular position.

Novel means are provided for bringing about the powerdrive of the quilland spindle and I for the manual operation of the quill and itsspindle'during-the rotation of the spindle. The rotary drive for thespindle and the power and manual feed'forthe quill'and spindle will nowbe described,

The armature shaft 32 of the motor 3| has keyed thereto a pulley 59-.Arranged in spaced parallel relation to the armature shaft 32 is an idlepulle shaft 60, and this shaft has keyed thereto an idle pulley 6|. Apulley belt 52 connects the pulleys 59 and 6| operatively together.

The pulleys 59 and'fil are of the speed change type so that the belt canbe shifted to a selected speed posit-ion. The idle pulley shaft 591 issupportedby bearings 63 in a bearing collar 64, and this collar isslidably mounted within the pulley casing 2!; by any desired means. Alsokeyed to the idle shaft SllQis a second idle pulley 65. This pulley hastrained thereabout a drive pulley belt 66 which is, in turn; trainedabout a drive pulley 61 keyed or otherwise secured to a drive head 68:This head surrounds the upper end of the spindle 25 and has a noveldriving connection withthespinclle as wi ll'be later described. The idleshaft 60 can; be adjusted in any preferred manner fortightening orloosening the belts 62 and 66 and as illustratedthe bearing sleeve 64has secured theretoan adjusting rod 69 which slidably extends through aboss Ill onthe pulley case; 28. Threaded on the rod 69 against thebossis an adjusting hand nut 10. Obviously, by turning the hand nut,therod and consequent ly, the bearing sleeve, can be moved out againstthe belts.

Referring to the driving connection between the drive head 68 and thespindle 25, it will be noted that the drive head 68 includes anelongated bearing sleeve H which extends through support 2! and axiallyinto the quill 24. Bearings l2 rotatably support the bearing sleeve H inthe support 2i, and the lower end of the sleeve has formed thereon. (seeFigures 7 and 8) the head enlargement l3. This head enlargement 13carries pairs of guide rollers M which are received within the guidegrooves 38 in the spindle 25. This serves to allow reciprocation of thespindle in the drive head and at the same time sets up a drivingconnection between the rotary head and the spindle. Each pair of guiderollers 14 is rotatably mounted on an eccentric shaft 55 carried by thehead enlargement 13. These shafts can be turned by a suitable wrench toadjust the rollers in and out toward and away from the spindle tocompensate for wear or any slack between the driving head iii; and thespindle. If preferred, the driving head enlargement is can be providedwith slots which extend inwardly from the opposite sides of the headenlargement to the bores which receive the eccentric shafts 15.Adjusting machine screws ii are threaded into the head enlargementthrough the slot l6 and by tightening these screws, the eccentric shafts75 can be firmly gripped for holding the same in a set adjustedposition.

In Figure 9, l have shown a slightly modified form of connection betweenthe spindle Z5 and the driving head 58. In this form of the inven tion,the lower end of the driving head is provided with a head enlargementwhich includes radially extending spaced pairs of ears l8 which can bearranged at thirds around the head. Each pair of ears receives aneccentric shaft or bolt J9. A guide roller 8!! is rotatably mounted onthe eccentric portion of each shaft or bolt. The rollers 8!! ride inlongitudinal guide grooves 8| formed in the spindle. The bolts oreccentric shafts are adjustable so that the rollers can be adjusted inand out toward and away from the axial center of the spindle.

Now referring to the feed of the quill 24 and the spindle 25 toward andaway from the work,

a pinion shaft 32 is rotatably carried by the body 23 at one side of thequill, and this shaft has formed thereon or secured thereto a pinion 83which meshes with pinion rack teeth 8d formed on one side of the quill24. Consequently, upon rotation of the pinion shaft 82, the quill andthe spindle can be raised or lowered according to the direction ofrotation of the pinion shaft. Loosely mounted on one end of the pinionshaft 82 is worm gear 84, and this worm gear meshes with a worm 85formed on or secured to a counter pinion 86. The counter pinion shaft isrotatably mounted in a bearing sleeve 5! carried by a part of the body23. The counter pinion. shaft 86 in turn has keyed thereto a worm wheelBil. and this worm wheel meshes with a worm 3% formed on or secured toan upright drive pinion shaft 9! The pinion shaft Sill is rotatablymounted in a suitable bearing 9! carried by part of the body 23. Securedto the extreme upper end of the drive pinion shaft is a pulley 92 andconnected with the idle pulley shaft Eill is a drive feed pulley 93. Apulley belt 94 operatively connects the drive feed pulley 93 with thepulley 92. The drive feed pulley 93 6 has a hub 95 which is normalypressed against the shaft 60 and the pulley 65 by a bolt 196 whichextends axially through the hub.

I also provide means for connecting and disconnecting the worm wheel 84with the pinion shaft 32. As inferred, the worm wheel lid is normallyrotatably mounted upon the pinion shaft and its hub can be pressed intodriving engagement with a shoulder on the pinion shaft and connectedwith the pinion shaft 32 by a clutch section a? feathered on said pinionshaft. The clutch section Els' has formed on one end a tapered facewhich is adapted to frictionally enthe walls of a socket 913 formed theworm wheel 8- 2. Secured to the pinion shaft is a collar as slidablycarrying pusher pins lllil. Threaded on the shaft 82 is a hand nut 5Eli, and by threading the hand nut if)! inward, the pins E will forcethe clutch section $1 into driving engagement with the walls of thesocket 528, thus bringing about the power drive of the shaft Bil and thepower feeding of the quill and the spindle.

Means are provided for manually turning the shaft 82 to feed the quilland spindle downward, such as when the device is being used similar to adrill press. When the device is being hand fed, the nut it! is turnedoutward, so as to relieve the pressure of the pins let against theclutch section at. This manual feed means includes a hand lever seacarried by a hub Hill. This hub is rotatably mounted on a tubularextension its on the pinion shaft 82. The hub Hi3 and the pinion shaftare provided with mating clutch teeth 5%, and the hub is normally urgedinward into operative driving engagement with the pinion shaft by aspring pressed plunger This plunger has connected with its outer end adisc it! which bears against the hub. An expansion spring Hill isconnected with the inner end of the plunger and its outer end bearsagainst a part of the pinion shaft. By pulling the handle Hi2 and thehub lilt outward, drive between the handie and the pinion shaft can bedisconnected. This will allow the handle to be ratche'ted back andforth.

A. spring return is provided for the pinion shaft 872 so that after thequill and the spindle is fed down, the return will automatically rotatethe pinion shaft 82 in a retrograde direction and raise the quill andthe spindle. The spring return is generally indicated by the referencecharacter its includes the coil spring i it wound about the shaft 82. Onend of the sprin is anchored by a pin Hi to the shaft, the opposite endof the spring is secured as at it? to the spring return case H3. Thecase lit ineludes an inner section i it and a removable outer sectionllli. Pins lie are utilized for connecting the inner section lid of thecase to the body The other section of the case is held againstdisplacement by a screw ill. The screw is carried by the section H5 andis received in an annular groove i it formed in the pinion shaft Afterthe section H5 is slipped on the pinion shaft 82, the screw i ii istightened so to hold the case section lit in place. The outer surface ofthe section H5 is provided with a graduated scale H5, and a pointer orzero line lid coop crates with the graduated scale to indicate to theoperator the downward distance of movement of th spindle.

From the description so far, it can be seen that a tool such as amilling cutter i as is connected by the collet structure 26 with thespindle and the body 23 is adjusted to the desired position on theoverarm. 2 Iv andon the castingtt; and. the. casting Themotortl is runinthe desired slidably mounted in a way, I23 formed in the.

This way opens into the body, and the body blocks are adapted'to. extendinto the. body for binding contact with the quill 24. Rotatably mountedin the block IZI-v is an adjusted screw IZd, and this screw is threadedinto the block I22. The outer end of the screw is provided with a I2Iihaving an internal polygonalsocket. A manipulating handle I26 is. fitted-on said head and has a polygonal portion extending into the socket- Ascrew I27 passes through, the handle into the adjusting screw I24 forholding the handle against displacement. Obviously, by tightenin up theadjusting, screw, the blocks I2I and I22 can be brought into bindincontact with the quill 24.

In conjunction with th downward feed of the quill 2t and the spindle 25,I provide an adjustable micrometer stop mechanism I2B. This mechanismincludes a stop block I29 rigidly fastened to the quill 24 for travelingmovement therewith, and this stop is adapted to engage a I stop I36carried by the body 23 and disposed in the path of the travel of thestop, I29. The stop I351 is in the nature of a traveling nut, and itsthreaded bore receives the micrometer feed screw I3 I. in a part of ahousing I32'carried by the body 23, and the adjustable stop I30 is heldagainst rotation by itsengagement. with said housing, The lower end ofthe screw is rotatably mounted in a suitable bearing I33 formed on saidbod 23.

Keyed or otherwise secured to the feed screw is a knurled finger knobI34 for turning the screw to position the stop I30at the desired point.The knob I34 has loosely mounted thereon a lock washer I 35, and thiswasher engages a part-of the body 23 so as to prevent the rotationthereof with the knob I34. The knob I34 and the lock washer I35 areprovided with cooperating scale and pointer so that the operator candetermine the position of the stop I 34 to regulate the down,- ward feedof the spindle. After the screw I3I has been rotated by the knob toposition the stop I30 at the desired point, the micrometer screw andknob are locked against further movement so;

that the same cannot he accidentally turned. This lock consists of athreaded knurled ring I31 mounted on the lock washer. I35. By threadingdown the ring I31 tight against the. washer, the.

lock washer can be jammed against. theknobfso as to hold the knob, and.consequently, the screw against accidental turning movement.

The novel collet mechanism for holding the cutter or other tool includesa split collet I38, and.

the opposite ends of the collet are tapered in opposite directions. Thetapered upper end of the collet is fitted in the tapered socket I39 inthe. lower end of the spindle 25 (see Figures 13 and 14). The spindlehas formed thereon adjacent to its lower end an annular grooved flangeI40. Slidably mounted upon the. spindle is a shifter The micrometer feedscrew I3I ismounted will later appear.

sleeve MI, and this shifter sleeve has its. lower.

" lower end of the spindle below the flange I40 is the collet closernose I M, and the inner periphery of this nose is tapered as at I45 forengagement with, the tapered lower outer end of the collet. The. nosehas threaded thereon a collar I46, and this. collar is slidable uponthe. flange I40 and has formed on its upper end the inwardly directedretaining flange, I41. Co-llet closer balls I48 are received between theflanges I40 of the spindle .end I41 and the collar I46 and are movableby the shifter sleeve I4I,

Laterally slidable upon the body 23 is a shifter yoke I49. sides toprovide guideways I50. The yoke I49 has formed on its upper edges guideribs I5I which are received in the guideways. The lower part of theyoke. (see Figures 10, 11 and 12) is provided with holding flanges I52for the shifter sleeve, and these flanges I52 fade away into asubstantially circular portion I53 formed. in said yoke.

When the shifter yoke is pushed, inwardly (see,

Figures 10 and 13), the circular portion I53 aligns with the flange I63of the shifter collar I M, so that the shifter collar will have freemovement with the spindle 25. In this position, the tool is firmlyclamped by the collet I39. When it is desired to release the collet, thespindle is raised to its extreme position, by operating, the hand feedlever to move the quill, sothat the flange I43 of the shifter sleeve I4Iwill be in horizontal alignmentwith the holding flanges I52 on the yokeI49. At this time, the yoke is pulled outwardly (see Figures ll'and 14),so that the flange I43 will be positioned between said holding flanges I52. The

spindle is now fed downward a slight distance by operating the hand feedlever to move the quill, and the shifter sleeve I4I will be held in araised position, and the lower tapered end I42 thereof will ride out ofthe grooved flange I40 of the spindle allowing the shifter balls I48 tomove inwardly toward the longitudinal axis of the spindle a slightdistance. This allows the nose I44 and its collar I45 suflicientlongitudinal play on the spindle, so that the nose can be pulled downaway from the collet I39. The tool can now be pulled out of the collect.When the tool is to be locked into the collet, the same is inserted inthe collet in the. ordinary way, and the spindle is moved upwardly byoperating the hand feed lever to move the quill '(Figure 14), and as theshifter sleeve. MI is held against movement, the lower desired positionas heretofore described, and the machine is set in operation as alsodescribed.

Upon downward movement of the quill, the stop I29 carried thereby willengage the stop I35 and limit further downward movement of the quill andthe feeding of the tool. The driving connection between the quill andthe motor is such that the belt 94 will slip. The operator can thenraise the quill by operating the hand feed lever.

From the foregoing description, it can be seen that I have provided avertical milling head attachment for a horizontal milling machine whichcan be quickly and instantly adjusted to different The body is groovedon its opposite,

- 9 angular positions and which can be successfully used as a drillpress.

While I have shown my novel milling head utilized particularly with ahorizontal milling machine, it is to be understood that the use of thehead is not limited to such machines. The head can be used inconjunction with other machines or as an independent unit on a drillpress standard or the like.

Changes in details may be made without departing from the spirit or thescope of my invention, but what I claim as new is:

1. A universal milling machine head comprising a body, a quilllongitudinally movable in said body, a spindle for a tool rotatablymounted in the spindle and movable longitudinally therewith, a pinionshaft rotatably carried by the body, rack teeth on the quill operativelyengaging the pinion shaft, a motor for rotating the spindle, meansincluding a clutch for rotating the shaft from the motor, a hand feedlever rotatable on the shaft, means for clutching the hand feed lever tothe shaft, 9, return spring for said shaft coiled about said shaft, ahousing for said return spring including an inner section and an outersection a rotatable on the inner section, means securing the innersection to the body, means anchoring one end of the spring to the shaft,means anchoring the opposite end of the spring to the inner section ofthe housing, means releasably securing prising a body, a quilllongitudinally slidable in said body, a spindle for a tool slidable withthe quill and rotatably mounted therein, a feed shaft for the quillhaving a pinion, a rack bar on the quill meshing with the pinion, meansfor manually rotating the shaft, means for indicating the amount ofmovement of the quill, a. motor for rotating the spindle, means forpower feeding the quill including a worm wheel loosely mounted on theshaft, means for rotating the worm wheel from the motor, a slidingclutch section feathered to said shaft for frictional binding contactwith the hub of the pinion, a collar secured to said shaft, pusher pinsslidably carried by the collar for the clutch section, and a nutthreaded on said shaft for bearing engagement against said pins.

3. A universal milling head attachment com prising a body, a quillslidably mounted in said body, means for advancing and retracting thequill, a, spindle for a toolv slidable with the quill and rotatablymounted therein, said spindle exr tending above the quill and providedwith longitudinal guide grooves, a drive head rotatably carried by thebody receiving the spindle, a motor for rotating said drive head, andguide rollers carried by the drive head received in said guide grooves.

i. A universal millin head attachment comprising a body, a quillslidably mounted in said body, means for advancing and retracting thequill, a spindle for a tool slidable with the quill and rotatablymounted therein, said spindle extending above the quill and providedwith longitudinal guide grooves, a drive head rotatably carried by thebody receiving the spindle, a motor for rotating said drive head, guiderollers carried by the drive head received in said guide grooves, andmeans for adjusting the rollers into and out of said guide grooves fortaking up play.

5. A universal milling head attachment comprising a body, a quillslidably mounted in said body, means for advancin and retracting thequill, a spindle for a tool slidable with the quill and rotatablymounted therein, said spindle extending above the quill and providedwith longitudinal guide grooves, a drive head rotatably carri'ed by thebody receiving the spindle, a motor for rotating said drive head, guiderollers carried by the drive head received in said guide grooves, meansfor adjusting the rollers into and out of said guide grooves for takingup play, said adjusting means including eccentric shafts on which therollers are mounted, and means for turning said shafts.

6. A universal milling attachment comprising a body, a quill slidablymounted in said body, means for sliding the quill in the body, a spindlefor a tool slidable with the quill and rotatable therein, means forrotating the spindle, a stop on said quill movable therewith, means forsetting the distance of feed of the quill and spindle including ahousing on the body, a micrometer screw rotatably mounted in saidhousing, a stop nut on the screw held against rotation by the housing,and a knob for rotating the screw for raising and lowering the stop nut,said stop nut being disposed in the path of travel of the stop on thequill.

7. A universal milling attachment comprising a body, a quill slidablymounted in said body, means for sliding the quill in the body, a spindlefor a tool slidable with the quill and rotatable therein, means forrotating the spindle, a stop on said quill movable therewith, means forsetting the distance of feed of the quill and spindle including ahousing on the body, a micrometer screw rotatably mounted in thehousing, a stop nut on the screw held against rotation by the housing, aknob for rotating the screw for raising and lowering the stop nut, saidstop nut bein disposed in the path of travel of the stop on the quill, alock washer mounted on the knob held against rotation by the housing, agraduated dial on the knob, an indicating line on the washer forcooperating with the graduations of the scale, and a jam nut threaded onthe knob for movement into and out of locking engagement with thewasher.

8. A universal milling head attachment comprising a body, a quillmovable longitudinally in said body, a spindle for a tool slidable withthe quill and rotatably mounted therein, means for driving the spindle,means for advancing and retracting the quill in the body, the lower endof the spindle having a tapered socket, a split collet having a taperedupper end received in said socket, said collet having a tapered lowerend also, a collet closing nose having a tapered opening receiving thetapered lower end of the collet slidably mounted on the spindle, acollar slidable with the nose having a retaining flange: on its upperend, said spindle having a grooved retaining flange, pusher ballsconfined between said flanges, a shifter sleeve slidably mounted on thespindle and movable toward and away from said balls, and a shiftersaddle slidably mounted on the body movable into and out of engagementwith the shifter sleeve for holding said sleeve against movement forrelease of the nose, said nose being released by moving the quill down.

9. The combination with a horizontal milling machine including anoverarm, of a vertical milling machine head including a body, a quilland spindle slidably carried by said body, an adapter sleeve receivingsaid overarm, said sleeve being :provided with a substantiallycylindrical collar :having its axis at right angles to the axis of thesleeve, guideways formed around said collar, a

supporting" disc, a saddleblock on said disc engaging the outer face ofthe collar, means car- ,ing the extension on the disc, and cooperativemeans between the extension and disc for turning said body on the discto a selected adjusted .position.

CHARLES TREE.

:12 REFERENCES CI'1ED The following references are of record in the fileof this patent:

UNITED STATES PATENTS Number Name Date 1,971,299 Fickett et a1. Aug. 21,1934 2,178,130 Zwick Oct. 31, 1939 2,267,336 Kindelberger Dec. 23, 19412,289,912 Hirsch July 14, 1942 2,296,573 Richards Sept. 22, 19422,404,561 Bannow July 23, 1946

